@charset "utf-8";
.img_list li{float: left;margin: 0;padding: 0;}
.img_list li img{display: block;width: 329px;position: relative;}
.articles{position: relative;}
.img_mask{position: absolute;top:0;left:0;display: block;background: #000;opacity: .3;width: 329px;height: 185px;}